Abstract
Stéphane Mallat, professor at École Polytechnique and founder of Let It Wave, presented various fundamental algorithms for high-definition television (HDTV) and their hardware implementation. HDTV requires considerable computing power, measured in tera-operations per second(1012 ops). A good example is the spatio-temporal resizing of images, which changes the number of points and the temporal frequency of their flow, passing a standard video sequence, for example, in higher resolution and at 100 Hz. Interpolations adapted to spatial expansion are well known in photography. Expansion in time is more complex, as it requires fine dynamic interpolation between given images to create the missing frames, at the risk of unpleasant jitter. S. Mallat presented pixel-by-pixel motion estimation techniques, which are far more refined than conventional block-based techniques, and showed how they can be efficiently implemented on dedicated circuits. He also showed the weaknesses of conventional MPEG-type compression algorithms, and how to eliminate them using a new strip transform.
